"Radioaktiv" stor solfläck (AR 1057)

Yesterday in new Mexico, a startling roar issued from the loudspeaker of amateur astronomer Thomas Ashcraft's radio telescope. "It was sunspot 1057," he says. "All day long it had been producing small radio bursts around 21 MHz. Then, at 1813 UT, it let loose a big one. The burst only lasted a minute, but it saturated the radios." LYSSNA HÄR:
http://www.heliotown.com/201003281813ut2123Ashcraft.mp3--------------------------------------------------------------------------------
The sounds you just heard were a mix of Type 111 and Type V radio emissions (SE NEDAN). They're caused by beams of electrons shooting out of the sunspot into the sun's atmosphere overhead. Not all sunspots produce radio emissions, but AR1057 is definitely "radio-active." "I'll be listening for more bursts in the days ahead," says Ashcraft.---------------------------------------------------------------------------------------------------------------------------------------------------------"Fördjupningar":-------------------------------------------------------------But why are these radio bursts important? Primarily, they give solar physicists an idea about the extreme magnetic fields and plasma conditions inside sunspots. Sunspots are produced when vast magnetic fields push through the surface of the sun, pushing the uppermost layer of the sun's body (the photosphere) away, exposing the cooler (thus darker) solar interior.
("Cooler" is a misnomer, nothing on the sun can be termed "cool." But when compared with the photospheric temperature of approximately 6,000 Kelvin, a sunspot interior can be as low as 3,000 Kelvin.)
As sunspots contain very intense magnetic fields, clouds of charged particles (plasma) are confined and injected along these fields. Often flares result, exciting electrons trapped in the plasma. As electrons accelerate (often to velocities close to the speed of light) and oscillate, theype III and Type V radio bursts are pretty much the same thing apart from differing periods; Type III emissions last for longer, where as Type V's are more bursty and associated with intense flare activity.--------------------------------------------------------------------------------------------
Type III: http://www-pw.physics.uiowa.edu/space-audio/typeIII.html-------------------------------------------------------
Type V: http://adsabs.harvard.edu/full/1967ApJ...150.1081W--------------------------------------- ---------------------------------------------
AR 1057 fotograferad från Sverige (den ena fläcken är dubbelt så stor som den andra, vars diameter är större än jorden [ja, människans bästa vän solen är stor] ): ------------------------------------http://photocamel.com/forum/all-other-styles-types/102549-sunspot.html